Pool Dumbbell Water Weight Heavy Hydro Therapy Aquatic Rehabilitation Heavy resistance closed cell foam with cushioned hand grip for easy grasping and extra comfort. These bar bells will not chip, crack or absorb water. Excellent for support and balance above the water or resistance exercises below the water. Often used in conjunction with water running belt. Quality product. Foam barbell has a smooth finish making it easy to clean and resistant to harboring bacteria (unlike the the typical white foam). Used on top of water for support and balance. e.g. gait training. Used underwater for resistance exercises e.g. strengthening and aerobic conditioning. Heavy Resistance: approximately 224 cubic inches (submerged force of about 9 lbs). Latex Free. Sold as a pair. Size: 12" long Foam: 4" x 6" diameter These bells are brand new (still in original plastic sealing), are of HEAVY resistance, are sold in pairs and are hugely popular with aqua aerobics class instructors.